SPIE Proceedings [SPIE International Conference on Optical Instruments and Technology (OIT2011) - Beijing, China (Sunday 6 November 2011)] 2011 International Conference on Optical Instruments and Technology: Solid State Lighting and Display Technologies, Holography, Speckle Pattern Interferometry, and Micro/Nano Manufacturing and Metrology - A new kind of high birefringence photonic crystal fibers with square-lattice cladding